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The following table lists standard mathematical functions, along with checks that should be performed to ensure a proper input domain, and indicates whether they can also result in range or pole errors, as reported by the C Standard. If a function has a specific domain over which it is defined, the programmer should must check its input values, and if a function throws range errors, the programmer should detect whether a range error occurs. The programmer must also check for range errors, where they might occur. The standard math functions not listed in this table, such as atan(), have no domain restrictions and cannot result in range or pole errors.
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#include <errno.h> #include <math.h> #if defined(math_errhandling) \ && (math_errhandling & MATH_ERREXCEPT) #include <fenv.h> #endif void func(double x) { double result; errno = 0; result result = sinh(x); #if defined(math_errhandling) \ && (math_errhandling & MATH_ERREXCEPT) feclearexcept(FE_ALL_EXCEPT); #endif errno = 0; #if !defined(math_errhandling) \ || (math_errhandling & MATH_ERRNO) if (errno != 0) { /* Handle range error */ } #endif #if defined(math_errhandling) \ && (math_errhandling & MATH_ERREXCEPT) if (fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) != 0) { /* Handle range error */ } #endif } |
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